Technical Reference Manual-XPM3m Revision Date: August 2014
XPM3m ENHANCED COOLING PACKAGE EC-2
Description: Optional on all machines
Performance Level: High Efficiency
Cooling Medium: Liquid
Warnings/Alarms: Coolant Low Flow, Coolant High Pressure
Controls: Adjustable coolant temperature
Facilities Impact: Uses on-board pump & reservoir system, waste heat exhausted through top of bonnet
The EC-2 Cooling package is optional on N2 machines and is meant to be used for the high end cooling
applications. It makes use of an internally mounted high efficiency heat exchanger to remove heat from the tunnel.
The upper cells in the cooling section are fitted with an internal fin & tube type heat exchanger. As recirculated gas
flows over the fin and tubes a transfer of heat from the air stream to the liquid stream is made. The heat is then
carried out of the tunnel via an on-board pump and reservoir system and exhausted through the top of the bonnet
via an externally mounted heat exchanger.
All upper cool cells with heat exchangers are supplied with hinged and latched faceplates that can be
opened from the inside of the tunnel. This provides access to remove, clean and maintain the heat exchangers with
a minimum of effort.
Cooling performance is dependent on the temperature of the machine-supplied coolant that has a control
range of 55 to 80°C. The external heat exchanger fans turn on and off to hold the coolant at ±2 °C from set point.
The coolant temperature adjustment provides an indirect control over the temperature of the cooling cells.
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